Increased West Antarctic and unchanged East Antarctic ice discharge over the last 7 years

Ice discharge from large ice sheets plays a direct role in determining rates of sea-level rise. We map present-day Antarctic-wide surface velocities using Landsat 7 and 8 imagery spanning 2013–2015 and compare to earlier estimates derived from synthetic aperture radar, revealing heterogeneous change...

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Veröffentlicht in:	The cryosphere 2018-02, Vol.12 (2), p.521-547
Hauptverfasser:	Gardner, Alex S, Moholdt, Geir, Scambos, Ted, Fahnstock, Mark, Ligtenberg, Stefan, van den Broeke, Michiel, Nilsson, Johan
Format:	Artikel
Sprache:	eng
Schlagworte:	Accelerated flow Accuracy Antarctic ice sheet Daylight Discharge Drainage Elevation Environmental aspects Estimates Flow mapping Glaciation Glacier flow Glaciers Ice Ice cover Ice sheets Ice shelves Image acquisition Imagery Land ice Landsat Landsat satellites Mapping Mass Methods Radar Remote sensing SAR (radar) Satellite imagery Sea level Sea level rise Snow accumulation Surface velocity Surface-ice melting Synthetic aperture radar Velocity
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Beschreibung
Zusammenfassung:	Ice discharge from large ice sheets plays a direct role in determining rates of sea-level rise. We map present-day Antarctic-wide surface velocities using Landsat 7 and 8 imagery spanning 2013–2015 and compare to earlier estimates derived from synthetic aperture radar, revealing heterogeneous changes in ice flow since ∼ 2008. The new mapping provides complete coastal and inland coverage of ice velocity north of 82.4° S with a mean error of
ISSN:	1994-0424 1994-0416 1994-0424 1994-0416
DOI:	10.5194/tc-12-521-2018